[Bug c/66970] Add __has_builtin() macro

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66970

--- Comment #23 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Mon Oct 28 22:46:28 2019
New Revision: 277544

URL: https://gcc.gnu.org/viewcvs?rev=277544&root=gcc&view=rev
Log:
PR c/66970 - Add __has_builtin() macro

gcc/ChangeLog:

        PR c/66970
        * doc/cpp.texi (__has_builtin): Document.
        * doc/extend.texi (__builtin_frob_return_addr): Correct spelling.

gcc/c/ChangeLog:

        PR c/66970
        * c-decl.c (names_builtin_p): Define a new function.

gcc/c-family/ChangeLog:

        PR c/66970
        * c-common.c (c_common_nodes_and_builtins): Call c_define_builtins
        even when only preprocessing.
        * c-common.h (names_builtin_p): Declare new function.
        * c-lex.c (init_c_lex): Set has_builtin.
        (c_common_has_builtin): Define a new function.
        * c-ppoutput.c (init_pp_output): Set has_builtin.

gcc/cp/ChangeLog:

        PR c/66970
        * cp-objcp-common.c (names_builtin_p): Define new function.

gcc/testsuite/ChangeLog:

        PR c/66970
        * c-c++-common/cpp/has-builtin-2.c: New test.
        * c-c++-common/cpp/has-builtin-3.c: New test.
        * c-c++-common/cpp/has-builtin.c: New test.


Added:
    trunk/gcc/testsuite/c-c++-common/cpp/has-builtin-2.c
    trunk/gcc/testsuite/c-c++-common/cpp/has-builtin-3.c
    trunk/gcc/testsuite/c-c++-common/cpp/has-builtin.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.c
    trunk/gcc/c-family/c-common.h
    trunk/gcc/c-family/c-lex.c
    trunk/gcc/c-family/c-ppoutput.c
    trunk/gcc/c/ChangeLog
    trunk/gcc/c/c-decl.c
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-objcp-common.c
    trunk/gcc/doc/cpp.texi
    trunk/gcc/doc/extend.texi
    trunk/gcc/testsuite/ChangeLog
    trunk/libcpp/include/cpplib.h
    trunk/libcpp/init.c
    trunk/libcpp/macro.c
    trunk/libcpp/traditional.c